Pump for spraying apparatus



Feb. 9, 1932.

R. L. BACHER ET AL PUMP FOR SPRAYING APPARATUS Filed Jan. 29, 1929Patented Feb. 9, 1932 UNITED STATES PATENT OFFICE ROLLIN L. BACI-IER ANDWALTER R. BAUMANOF LAKEWOOD, OHIO, ASSIG-NORS 'lO THE UNITED STATES AIRCOMPRESSOR COMPANY, OF CLEVELAND, OHIO, A CORIO- RATION OF OHIO PUMPFOB. SPRAYING APPARATUS Application led January 29, 1929. Serial No.335,941.

This invention relates to spraying` apparatus and particularly to aportable power operated device which is suitable for spraying paint,varnish and the like. It is well known that the spraying of relativelyheavy liquids requires a substantially high pressure of air, and thatsuch pressure is supplied by large power driven compressors. Forspraying.;` use in homes and other places however, which are notequipped with air under relatively high pressure, the application of spaymg apparatus has been limited to small work for which a. hand sprayproduces satisfactory results.

In developing a relatively small power spray unit such as one whereinthe power apparatus is portable, we have found that a motor drivencompressor unit in order to be suliiciently light in weight must operateat a spoed approximately 2,()O0-revolutions per minute. 1We have alsofound that in developing a compressor unit having these characteristics,that the unit has a tendency to vibrate and move across the floor uponwhich it is located. were made to avoid such action by using pistons andother internal parts of relatively light material and by balancing therotative parts, but notwithstanding the iinest degree of balance, theunit continued to creep across the floor.

The principal object of the present invention therefore, is theproduction of a power operated compressor, which is suiliciently ligl'ltin weight that it may be readily carried by one hand, and easilytransported from place to place, and yet will possess sufficient powerto permit relatively heavy liquids to be used in the spray gun. Afurther objec-t of our invention is to make a power compressor unit,which may be operated at a high rate of speed and which, when sooperated, will not creep across the floor.

We accomplish the above objects by mountingr a single cylinder aircompressor and a Experimental effort-s directly connected electric motorupona common portable base. The air supplied from the compressor ispassed through a moisture separator, and is then conducted throughiler;-Y

ible hose to an atomizer of conventional design, The compressor operatesat relatively high speed so as to produce the .necessary power from arelatively small compressor. To prevent creeping of the power unitdurino' operation7 we mount a flywheel on each side of the compressori'.Since the cranlr shaft constitutes an extension of the armature shaft ofthe motor, the lywheels7 compressor and motor all operate at the samerate of speed.

Referring now to the drawings, Fig. 1 is a side elevation, partly insection, of a power' spray apparatus made in accordance with ourinvention and Fig. 2 is a vertical section taken through the apparatuson a plane indicated by the line 2--2 in Fig. 1.

ln the preferred fornu'the apparatus embodying our invention comprisesan electric motor 10, and a direct connected air compresser l1, whichare mounted upon a common base 12. A flexible coupling 13 provides aconnection between the armature shaft 14 of the motor and the crankshaft 15 of the compressor. The compressor shown is a single cylinderunit having a cylinder head 16 which carries an inta-ke valve 17, and anoutlet valve 18.

The valve openings are disposed directly` beyond the crank case. "Aflywheel 22 may then be mounted on the crank shaft extension Whileanother flywheel 23 is mounted on that part of the shaft, which isdisposed between the coupling and the crank case. We have found thatflywheels arranged in this man-` ner enable the compressor to beoperated at 28. Av thumb operated valve is shown adjav cent the handle0f the spray gun for con trolling the air flow through the apparatus inthe usual way. The moisture separator Vis shown as a hollow casing whichis supported by legs 30, and which is fastened by suitable securingmembers to the base l2. The separator straddles the coupling andprovides a suitable protecting device therefor. A baffle 31 extendsacross the separator chamber and .v

defiects air entering the separator from conduit 25 and since the outletof the separator is disposed on that sideV of the baffle opposite theinlet, the moisture will'have a tendency to collecton the bottom of theseparator, from whence it may be drained through a valve 35.

To make the power unit portable, we provide a handle l0 which may beattached to the unit adjacent the mid portion thereof. The separatorbeing disposed between the motor and compressor makes a suitable placefor attaching the handle. By making the vertical portion 41 of thehandle hollow, a passageway is provided for the attachment of" a safetyvalve 42. Y.

lnk view of the foregoing description, it will be obvious Vthat we haveprovided a power spraying unit which is sufficiently light in weight tobe portable, and yet which possesses sufcient power to atomizeVrelatively heavy liquids. This device provides therefore a relativelyinexpensive unit which greatly extends the field of usefulness forspraying apparatus.

We'cla-im: s y

A motor compressor `unit comprising 'in combination, a portable base, anelectric mo# tor and an air'compressor mounted thereon, said motorhaving an armature shaft and the air compressor having a crank shaft,said shafts being substantially in alignment with each other, a iexiblecoupling providing an operative connection between the shafts,the crankshaft being extended outside the compressor, a flywheel mounted on thecrank shaft on each'side of the compressor, a mois' ture separator alsomounted on the base, and havingv vertically extending portions in close'proximity to the coupling and providing aV shield' therefor, and havinga moisture cham ber above the coupling,.af baffle within the chamber,said'chamber having an inlet disposed on one side -of the baffle andanoutlet disposed on the'other side of the baiie, means connecting theinlet to the compressor and a flexible discharge conduit connected tothe outlet, and the upper end of the moisture separator terminating in ahandle, said handle signatures.

i -WALTER R. BAUMAN.

ROLLIN L. BACHER.

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